libcamera: IPAInterface: Replace C API with the new C++-only API

Remove everything related to the C API, including ipa_context,
ipa_context_wrapper, and IPAInterfaceWrapper. Also remove relevant
documentation.

ipaCreate() provided by IPA implementations, and createInterface()
provided by IPAModule (wrapper around IPA implementation) both now
return a C++ object IPAInterface instead of struct ipa_context.

Although IPAInterfaceWrapper is the only component of libipa, the
skeleton and build files for libipa are retained.

After converting the C API to the C++-only API, make all pipeline
handlers and IPAs use the new API.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

This is a combination of 21 commits:

---

libcamera: IPAModule: Replace ipa_context with IPAInterface

With the new IPC infrastructure, we no longer need the C interface as
provided by struct ipa_context. Make ipaCreate_() and createInterface()
return IPAInterface.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: ipa_context_wrapper: Remove ipa_context_wrapper

Since ipa_context has been replaced with custom IPAInterfaces, it is not
longer needed. Remove it.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: IPAInterface: remove ipa_context and functions from documentation

Remove all the documentation related to ipa_context and the C IPA API,
as well as the documentation about the functions in the IPAInterface.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

---

libcamera: IPAInterface: Remove all functions from IPAInterface

Now that all the functions in the IPA interface are defined in the data
definition file and a specialized IPAInterface is generated per pipeline
handler, remove all the functions from the base IPAInterface.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: IPAInterface: make ipaCreate return IPAInterface

With the new IPC infrastructure, we no longer need the C interface as
provided by struct ipa_context. Make ipaCreate return IPAinterface.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

---

ipa: remove IPAInterfaceWrapper

As every pipeline has its own proxy, IPAInterfaceWrapper is no
longer necessary. Remove it.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Acked-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>

---

libcamera: IPAProxy: Remove stop() override

Since stop() is part of the IPA interface, and the IPA interface is now
generated based on the data definition file per pipeline, this no longer
needs to be overrided by the base IPAProxy. Remove it.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: IPAProxy, IPAManager: Switch to one-proxy-per-pipeline scheme

IPAProxy is changed in two major ways:
- Every pipeline has its own proxy, to support each pipeline's IPA
  interface
- IPAProxy implementations always encapsulate IPA modules, and switch
  internally for isolation or threaded

The IPAProxy registration mechanism is removed, as each pipeline will
have its own proxy, so the pipeline can pass the specialized class name
of the IPAProxy to the IPAManager for construction.

IPAManager is changed accordingly to support these changes:
- createIPA is a template function that takes an IPAProxy class, and
  always returns an IPAProxy
- IPAManager no longer decides on isolation, and simply creates an
  IPAProxy instance while passing the isolation flag

Consequently, the old IPAProxy classes (IPAProxyThread and
IPAProxyLinux) are removed. The IPAInterfaceTest is updated to use
the new IPAManager interface, and to construct a ProcessManager as no
single global instance is created anymore.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>

---

libcamera: IPAProxy: Add isolate parameter to create()

Since IPAProxy implementations now always encapsulate IPA modules, add a
parameter to create() to signal if the proxy should isolate the IPA or not.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: IPAManager: Fetch IPAProxy corresponding to pipeline

Now that each pipeline handler has its own IPAProxy implementation, make
the IPAManager fetch the IPAProxy based on the pipeline handler name.
Also, since the IPAProxy is used regardless of isolation or no
isolation, remove the isolation check from the proxy selection.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>

---

libcamera: IPAManager: add isolation flag to proxy creation

When the IPA proxy is created, it needs to know whether to isolate or
not. Feed the flag at creation of the IPA proxy.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: IPAManager: Make createIPA return proxy directly

Since every pipeline knows the type of the proxy that it needs, and
since all IPAs are to be wrapped in a proxy, IPAManager no longer needs
to search in the factory list to fetch the proxy factory to construct a
factory. Instead, we define createIPA as a template function, and the
pipeline handler can declare the proxy type when it calls createIPA.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: IPAProxy: Remove registration mechanism

Implementations of IPA proxies use a registration mechanism to register
themselves with the main IPA proxy factory. This registration declares
static objects, causing a risk of things being constructed before the
proper libcamera facilities are ready. Since each pipeline handler has
its own IPA proxy and knows the type, it isn't necessary to have a proxy
factory. Remove it to alleviate the risk of early construction.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: proxy: Remove IPAProxyLinux and IPAProxyThread

We have now changed the proxy from per-IPC mechanism to per-pipeline.
The per-IPC mechanism proxies are thus no longer needed; remove them.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

tests: ipa_interface_test: Update to use new createIPA

Update the IPA interface test to use the new createIPA function from
IPAManager. Also create an instance of ProcessManager, as no single
global instance is created automatically anymore. Update meson.build to
to depend on the generated IPA interface headers.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: PipelineHandler: Remove IPA from base class

Since pipeline handlers now have their own IPA interface types, it can no
longer be defined in the base class, and each pipeline handler
implementation must declare it and its type themselves. Remove it from
the base class.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo@jmondi.org>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

ipa: raspberrypi: Add mojom data definition file

Add a mojom data definition for raspberrypi pipeline handler's IPAs.
This simplifies the API between the raspberrypi pipeline handler and the
IPA, and is not a direct translation of what was used before with
IPAOperationData.

Also move the enums from raspberrypi.h to raspberrypi.mojom

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: pipeline, ipa: raspberrypi: Use new data definition

Now that we can generate custom functions and data structures with mojo,
switch the raspberrypi pipeline handler and IPA to use the custom data
structures as defined in the mojom data definition file.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: pipeline, ipa: vimc: Support the new IPC mechanism

Add support to vimc pipeline handler and IPA for the new IPC mechanism.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>

---

libcamera: pipeline, ipa: rkisp1: Support the new IPC mechanism

Add support to the rkisp1 pipeline handler and IPA for the new IPC
mechanism.

Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

---

libcamera: pipeline, ipa: ipu3: Support the new IPC mechanism

Add support to ipu3 pipeline handler and IPA for the new IPC mechanism.

[Original version]
Signed-off-by: Niklas Söderlund <niklas.soderlund@ragnatech.se>
Reviewed-by: Paul Elder <paul.elder@ideasonboard.com>
[Fixed commit message and small changes]
Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>

3 files changed, 132 insertions, 136 deletions

diff --git a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
index e4764681..15aa600e 100644
--- a/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
+++ b/src/libcamera/pipeline/raspberrypi/raspberrypi.cpp
@@ -18,10 +18,13 @@
 #include <libcamera/file_descriptor.h>
 #include <libcamera/formats.h>
 #include <libcamera/ipa/raspberrypi.h>
+#include <libcamera/ipa/raspberrypi_ipa_interface.h>
+#include <libcamera/ipa/raspberrypi_ipa_proxy.h>
 #include <libcamera/logging.h>
 #include <libcamera/property_ids.h>
 #include <libcamera/request.h>
 
+#include <linux/bcm2835-isp.h>
 #include <linux/videodev2.h>
 
 #include "libcamera/internal/bayer_format.h"
@@ -146,7 +149,11 @@ public:
 	int loadIPA();
 	int configureIPA(const CameraConfiguration *config);
 
-	void queueFrameAction(unsigned int frame, const IPAOperationData &action);
+	void statsMetadataComplete(uint32_t bufferId, const ControlList &controls);
+	void runIsp(uint32_t bufferId);
+	void embeddedComplete(uint32_t bufferId);
+	void setIsp(const ControlList &controls);
+	void setDelayedControls(const ControlList &controls);
 
 	/* bufferComplete signal handlers. */
 	void unicamBufferDequeue(FrameBuffer *buffer);
@@ -159,6 +166,8 @@ public:
 	void handleState();
 	void applyScalerCrop(const ControlList &controls);
 
+	std::unique_ptr<ipa::rpi::IPAProxyRPi> ipa_;
+
 	std::unique_ptr<CameraSensor> sensor_;
 	/* Array of Unicam and ISP device streams and associated buffers/streams. */
 	RPi::Device<Unicam, 2> unicam_;
@@ -751,7 +760,7 @@ int PipelineHandlerRPi::exportFrameBuffers([[maybe_unused]] Camera *camera, Stre
 	return ret;
 }
 
-int PipelineHandlerRPi::start(Camera *camera, [[maybe_unused]] ControlList *controls)
+int PipelineHandlerRPi::start(Camera *camera, ControlList *controls)
 {
 	RPiCameraData *data = cameraData(camera);
 	int ret;
@@ -769,30 +778,20 @@ int PipelineHandlerRPi::start(Camera *camera, [[maybe_unused]] ControlList *cont
 		data->applyScalerCrop(*controls);
 
 	/* Start the IPA. */
-	IPAOperationData ipaData = {};
-	IPAOperationData result = {};
-	if (controls) {
-		ipaData.operation = RPi::IPA_CONFIG_STARTUP_CTRLS;
-		ipaData.controls.emplace_back(*controls);
-	}
-	ret = data->ipa_->start(ipaData, &result);
-	if (ret) {
-		LOG(RPI, Error)
-			<< "Failed to start IPA for " << camera->id();
-		stop(camera);
-		return ret;
-	}
+	ipa::rpi::StartControls ipaData;
+	ipa::rpi::StartControls result;
+	if (controls)
+		ipaData.controls = *controls;
+	data->ipa_->start(ipaData, &result);
 
 	/* Apply any gain/exposure settings that the IPA may have passed back. */
-	if (result.operation & RPi::IPA_RESULT_SENSOR_CTRLS) {
-		ControlList &ctrls = result.controls[0];
+	if (!result.controls.empty()) {
+		ControlList &ctrls = result.controls;
 		data->unicam_[Unicam::Image].dev()->setControls(&ctrls);
 	}
 
-	if (result.operation & RPi::IPA_RESULT_DROP_FRAMES) {
-		/* Configure the number of dropped frames required on startup. */
-		data->dropFrameCount_ = result.data[0];
-	}
+	/* Configure the number of dropped frames required on startup. */
+	data->dropFrameCount_ = result.dropFrameCount;
 
 	/* We need to set the dropFrameCount_ before queueing buffers. */
 	ret = queueAllBuffers(camera);
@@ -1115,8 +1114,8 @@ int PipelineHandlerRPi::prepareBuffers(Camera *camera)
 	 * Pass the stats and embedded data buffers to the IPA. No other
 	 * buffers need to be passed.
 	 */
-	mapBuffers(camera, data->isp_[Isp::Stats].getBuffers(), RPi::BufferMask::STATS);
-	mapBuffers(camera, data->unicam_[Unicam::Embedded].getBuffers(), RPi::BufferMask::EMBEDDED_DATA);
+	mapBuffers(camera, data->isp_[Isp::Stats].getBuffers(), ipa::rpi::MaskStats);
+	mapBuffers(camera, data->unicam_[Unicam::Embedded].getBuffers(), ipa::rpi::MaskEmbeddedData);
 
 	return 0;
 }
@@ -1133,8 +1132,8 @@ void PipelineHandlerRPi::mapBuffers(Camera *camera, const RPi::BufferMap &buffer
 	 * handler and the IPA.
 	 */
 	for (auto const &it : buffers) {
-		ipaBuffers.push_back({ .id = mask | it.first,
-				       .planes = it.second->planes() });
+		ipaBuffers.push_back(IPABuffer(mask | it.first,
+					       it.second->planes()));
 		data->ipaBuffers_.insert(mask | it.first);
 	}
 
@@ -1165,15 +1164,18 @@ void RPiCameraData::frameStarted(uint32_t sequence)
 
 int RPiCameraData::loadIPA()
 {
-	ipa_ = IPAManager::createIPA(pipe_, 1, 1);
+	ipa_ = IPAManager::createIPA<ipa::rpi::IPAProxyRPi>(pipe_, 1, 1);
+
 	if (!ipa_)
 		return -ENOENT;
 
-	ipa_->queueFrameAction.connect(this, &RPiCameraData::queueFrameAction);
+	ipa_->statsMetadataComplete.connect(this, &RPiCameraData::statsMetadataComplete);
+	ipa_->runIsp.connect(this, &RPiCameraData::runIsp);
+	ipa_->embeddedComplete.connect(this, &RPiCameraData::embeddedComplete);
+	ipa_->setIsp.connect(this, &RPiCameraData::setIsp);
+	ipa_->setDelayedControls.connect(this, &RPiCameraData::setDelayedControls);
 
-	IPASettings settings{
-		.configurationFile = ipa_->configurationFile(sensor_->model() + ".json")
-	};
+	IPASettings settings(ipa_->configurationFile(sensor_->model() + ".json"));
 
 	return ipa_->init(settings);
 }
@@ -1185,8 +1187,8 @@ int RPiCameraData::configureIPA(const CameraConfiguration *config)
 		static_cast<const RPiCameraConfiguration *>(config);
 
 	std::map<unsigned int, IPAStream> streamConfig;
-	std::map<unsigned int, const ControlInfoMap &> entityControls;
-	IPAOperationData ipaConfig = {};
+	std::map<unsigned int, ControlInfoMap> entityControls;
+	ipa::rpi::ConfigInput ipaConfig;
 
 	/* Get the device format to pass to the IPA. */
 	V4L2DeviceFormat sensorFormat;
@@ -1195,10 +1197,9 @@ int RPiCameraData::configureIPA(const CameraConfiguration *config)
 	unsigned int i = 0;
 	for (auto const &stream : isp_) {
 		if (stream.isExternal()) {
-			streamConfig[i++] = {
-				.pixelFormat = stream.configuration().pixelFormat,
-				.size = stream.configuration().size
-			};
+			streamConfig[i++] = IPAStream(
+				stream.configuration().pixelFormat,
+				stream.configuration().size);
 		}
 	}
 
@@ -1206,17 +1207,20 @@ int RPiCameraData::configureIPA(const CameraConfiguration *config)
 	entityControls.emplace(1, isp_[Isp::Input].dev()->controls());
 
 	/* Always send the user transform to the IPA. */
-	ipaConfig.data = { static_cast<unsigned int>(config->transform) };
+	ipaConfig.transform = static_cast<unsigned int>(config->transform);
 
 	/* Allocate the lens shading table via dmaHeap and pass to the IPA. */
 	if (!lsTable_.isValid()) {
-		lsTable_ = dmaHeap_.alloc("ls_grid", RPi::MaxLsGridSize);
+		lsTable_ = dmaHeap_.alloc("ls_grid", ipa::rpi::MaxLsGridSize);
 		if (!lsTable_.isValid())
 			return -ENOMEM;
 
 		/* Allow the IPA to mmap the LS table via the file descriptor. */
-		ipaConfig.operation = RPi::IPA_CONFIG_LS_TABLE;
-		ipaConfig.data.push_back(static_cast<unsigned int>(lsTable_.fd()));
+		/*
+		 * \todo Investigate if mapping the lens shading table buffer
+		 * could be handled with mapBuffers().
+		 */
+		ipaConfig.lsTableHandle = lsTable_;
 	}
 
 	/* We store the CameraSensorInfo for digital zoom calculations. */
@@ -1227,35 +1231,34 @@ int RPiCameraData::configureIPA(const CameraConfiguration *config)
 	}
 
 	/* Ready the IPA - it must know about the sensor resolution. */
-	IPAOperationData result = {};
+	ipa::rpi::ConfigOutput result;
 
 	ipa_->configure(sensorInfo_, streamConfig, entityControls, ipaConfig,
-			&result);
+			&result, &ret);
 
-	if (result.operation & RPi::IPA_RESULT_CONFIG_FAILED) {
+	if (ret < 0) {
 		LOG(RPI, Error) << "IPA configuration failed!";
 		return -EPIPE;
 	}
 
-	unsigned int resultIdx = 0;
-	if (result.operation & RPi::IPA_RESULT_SENSOR_PARAMS) {
+	if (result.params & ipa::rpi::ConfigStaggeredWrite) {
 		/*
 		 * Setup our delayed control writer with the sensor default
 		 * gain and exposure delays.
 		 */
 		std::unordered_map<uint32_t, unsigned int> delays = {
-			{ V4L2_CID_ANALOGUE_GAIN, result.data[resultIdx++] },
-			{ V4L2_CID_EXPOSURE, result.data[resultIdx++] },
-			{ V4L2_CID_VBLANK, result.data[resultIdx++] }
+			{ V4L2_CID_ANALOGUE_GAIN, result.sensorConfig.gainDelay },
+			{ V4L2_CID_EXPOSURE, result.sensorConfig.exposureDelay },
+			{ V4L2_CID_VBLANK, result.sensorConfig.vblank }
 		};
 
 		delayedCtrls_ = std::make_unique<DelayedControls>(unicam_[Unicam::Image].dev(), delays);
 
-		sensorMetadata_ = result.data[resultIdx++];
+		sensorMetadata_ = result.sensorConfig.sensorMetadata;
 	}
 
-	if (result.operation & RPi::IPA_RESULT_SENSOR_CTRLS) {
-		ControlList &ctrls = result.controls[0];
+	if (!result.controls.empty()) {
+		ControlList &ctrls = result.controls;
 		unicam_[Unicam::Image].dev()->setControls(&ctrls);
 	}
 
@@ -1275,90 +1278,86 @@ int RPiCameraData::configureIPA(const CameraConfiguration *config)
 	return 0;
 }
 
-void RPiCameraData::queueFrameAction([[maybe_unused]] unsigned int frame,
-				     const IPAOperationData &action)
+void RPiCameraData::statsMetadataComplete(uint32_t bufferId, const ControlList &controls)
 {
+	if (state_ == State::Stopped)
+		handleState();
+
+	FrameBuffer *buffer = isp_[Isp::Stats].getBuffers().at(bufferId);
+
+	handleStreamBuffer(buffer, &isp_[Isp::Stats]);
+
+	/* Fill the Request metadata buffer with what the IPA has provided */
+	Request *request = requestQueue_.front();
+	request->metadata() = std::move(controls);
+
 	/*
-	 * The following actions can be handled when the pipeline handler is in
-	 * a stopped state.
+	 * Also update the ScalerCrop in the metadata with what we actually
+	 * used. But we must first rescale that from ISP (camera mode) pixels
+	 * back into sensor native pixels.
+	 *
+	 * Sending this information on every frame may be helpful.
 	 */
-	switch (action.operation) {
-	case RPi::IPA_ACTION_SET_DELAYED_CTRLS: {
-		const ControlList &controls = action.controls[0];
-		if (!delayedCtrls_->push(controls))
-			LOG(RPI, Error) << "Failed to set delayed controls";
-		goto done;
+	if (updateScalerCrop_) {
+		updateScalerCrop_ = false;
+		scalerCrop_ = ispCrop_.scaledBy(sensorInfo_.analogCrop.size(),
+						sensorInfo_.outputSize);
+		scalerCrop_.translateBy(sensorInfo_.analogCrop.topLeft());
 	}
+	request->metadata().set(controls::ScalerCrop, scalerCrop_);
 
-	case RPi::IPA_ACTION_V4L2_SET_ISP: {
-		ControlList controls = action.controls[0];
-		isp_[Isp::Input].dev()->setControls(&controls);
-		goto done;
-	}
-	}
+	state_ = State::IpaComplete;
 
-	if (state_ == State::Stopped)
-		goto done;
+	handleState();
+}
 
-	/*
-	 * The following actions must not be handled when the pipeline handler
-	 * is in a stopped state.
-	 */
-	switch (action.operation) {
-	case RPi::IPA_ACTION_STATS_METADATA_COMPLETE: {
-		unsigned int bufferId = action.data[0];
-		FrameBuffer *buffer = isp_[Isp::Stats].getBuffers().at(bufferId);
+void RPiCameraData::runIsp(uint32_t bufferId)
+{
+	if (state_ == State::Stopped)
+		handleState();
 
-		handleStreamBuffer(buffer, &isp_[Isp::Stats]);
+	FrameBuffer *buffer = unicam_[Unicam::Image].getBuffers().at(bufferId);
 
-		/* Fill the Request metadata buffer with what the IPA has provided */
-		Request *request = requestQueue_.front();
-		request->metadata() = std::move(action.controls[0]);
+	LOG(RPI, Debug) << "Input re-queue to ISP, buffer id " << bufferId
+			<< ", timestamp: " << buffer->metadata().timestamp;
 
-		/*
-		 * Also update the ScalerCrop in the metadata with what we actually
-		 * used. But we must first rescale that from ISP (camera mode) pixels
-		 * back into sensor native pixels.
-		 *
-		 * Sending this information on every frame may be helpful.
-		 */
-		if (updateScalerCrop_) {
-			updateScalerCrop_ = false;
-			scalerCrop_ = ispCrop_.scaledBy(sensorInfo_.analogCrop.size(),
-							sensorInfo_.outputSize);
-			scalerCrop_.translateBy(sensorInfo_.analogCrop.topLeft());
-		}
-		request->metadata().set(controls::ScalerCrop, scalerCrop_);
+	isp_[Isp::Input].queueBuffer(buffer);
+	ispOutputCount_ = 0;
+	handleState();
+}
 
-		state_ = State::IpaComplete;
-		break;
-	}
+void RPiCameraData::embeddedComplete(uint32_t bufferId)
+{
+	if (state_ == State::Stopped)
+		handleState();
 
-	case RPi::IPA_ACTION_EMBEDDED_COMPLETE: {
-		unsigned int bufferId = action.data[0];
-		FrameBuffer *buffer = unicam_[Unicam::Embedded].getBuffers().at(bufferId);
-		handleStreamBuffer(buffer, &unicam_[Unicam::Embedded]);
-		break;
-	}
+	FrameBuffer *buffer = unicam_[Unicam::Embedded].getBuffers().at(bufferId);
+	handleStreamBuffer(buffer, &unicam_[Unicam::Embedded]);
+	handleState();
+}
 
-	case RPi::IPA_ACTION_RUN_ISP: {
-		unsigned int bufferId = action.data[0];
-		FrameBuffer *buffer = unicam_[Unicam::Image].getBuffers().at(bufferId);
+void RPiCameraData::setIsp(const ControlList &controls)
+{
+	ControlList ctrls = controls;
 
-		LOG(RPI, Debug) << "Input re-queue to ISP, buffer id " << bufferId
-				<< ", timestamp: " << buffer->metadata().timestamp;
+	Span<const uint8_t> s =
+		ctrls.get(V4L2_CID_USER_BCM2835_ISP_LENS_SHADING).data();
+	bcm2835_isp_lens_shading ls =
+		*reinterpret_cast<const bcm2835_isp_lens_shading *>(s.data());
+	ls.dmabuf = lsTable_.fd();
 
-		isp_[Isp::Input].queueBuffer(buffer);
-		ispOutputCount_ = 0;
-		break;
-	}
+	ControlValue c(Span<const uint8_t>{ reinterpret_cast<uint8_t *>(&ls),
+					    sizeof(ls) });
+	ctrls.set(V4L2_CID_USER_BCM2835_ISP_LENS_SHADING, c);
 
-	default:
-		LOG(RPI, Error) << "Unknown action " << action.operation;
-		break;
-	}
+	isp_[Isp::Input].dev()->setControls(&ctrls);
+	handleState();
+}
 
-done:
+void RPiCameraData::setDelayedControls(const ControlList &controls)
+{
+	if (!delayedCtrls_->push(controls))
+		LOG(RPI, Error) << "V4L2 staggered set failed";
 	handleState();
 }
 
@@ -1456,10 +1455,7 @@ void RPiCameraData::ispOutputDequeue(FrameBuffer *buffer)
 	 * application until after the IPA signals so.
 	 */
 	if (stream == &isp_[Isp::Stats]) {
-		IPAOperationData op;
-		op.operation = RPi::IPA_EVENT_SIGNAL_STAT_READY;
-		op.data = { RPi::BufferMask::STATS | static_cast<unsigned int>(index) };
-		ipa_->processEvent(op);
+		ipa_->signalStatReady(ipa::rpi::MaskStats | static_cast<unsigned int>(index));
 	} else {
 		/* Any other ISP output can be handed back to the application now. */
 		handleStreamBuffer(buffer, stream);
@@ -1563,7 +1559,7 @@ void RPiCameraData::handleExternalBuffer(FrameBuffer *buffer, RPi::Stream *strea
 {
 	unsigned int id = stream->getBufferId(buffer);
 
-	if (!(id & RPi::BufferMask::EXTERNAL_BUFFER))
+	if (!(id & ipa::rpi::MaskExternalBuffer))
 		return;
 
 	/* Stop the Stream object from tracking the buffer. */
@@ -1663,7 +1659,6 @@ void RPiCameraData::applyScalerCrop(const ControlList &controls)
 void RPiCameraData::tryRunPipeline()
 {
 	FrameBuffer *bayerBuffer, *embeddedBuffer;
-	IPAOperationData op;
 
 	/* If any of our request or buffer queues are empty, we cannot proceed. */
 	if (state_ != State::Idle || requestQueue_.empty() ||
@@ -1684,9 +1679,7 @@ void RPiCameraData::tryRunPipeline()
 	 * queue the ISP output buffer listed in the request to start the HW
 	 * pipeline.
 	 */
-	op.operation = RPi::IPA_EVENT_QUEUE_REQUEST;
-	op.controls = { request->controls() };
-	ipa_->processEvent(op);
+	ipa_->signalQueueRequest(request->controls());
 
 	/* Set our state to say the pipeline is active. */
 	state_ = State::Busy;
@@ -1694,14 +1687,14 @@ void RPiCameraData::tryRunPipeline()
 	unsigned int bayerId = unicam_[Unicam::Image].getBufferId(bayerBuffer);
 	unsigned int embeddedId = unicam_[Unicam::Embedded].getBufferId(embeddedBuffer);
 
-	LOG(RPI, Debug) << "Signalling RPi::IPA_EVENT_SIGNAL_ISP_PREPARE:"
+	LOG(RPI, Debug) << "Signalling signalIspPrepare:"
 			<< " Bayer buffer id: " << bayerId
 			<< " Embedded buffer id: " << embeddedId;
 
-	op.operation = RPi::IPA_EVENT_SIGNAL_ISP_PREPARE;
-	op.data = { RPi::BufferMask::EMBEDDED_DATA | embeddedId,
-		    RPi::BufferMask::BAYER_DATA | bayerId };
-	ipa_->processEvent(op);
+	ipa::rpi::ISPConfig ispPrepare;
+	ispPrepare.embeddedbufferId = ipa::rpi::MaskEmbeddedData | embeddedId;
+	ispPrepare.bayerbufferId = ipa::rpi::MaskBayerData | bayerId;
+	ipa_->signalIspPrepare(ispPrepare);
 }
 
 bool RPiCameraData::findMatchingBuffers(FrameBuffer *&bayerBuffer, FrameBuffer *&embeddedBuffer)
diff --git a/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp b/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp
index 3a5dadab..496dd36f 100644
--- a/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp
+++ b/src/libcamera/pipeline/raspberrypi/rpi_stream.cpp
@@ -6,6 +6,8 @@
  */
 #include "rpi_stream.h"
 
+#include <libcamera/ipa/raspberrypi_ipa_interface.h>
+
 #include "libcamera/internal/log.h"
 
 namespace libcamera {
@@ -70,7 +72,7 @@ int Stream::getBufferId(FrameBuffer *buffer) const
 
 void Stream::setExternalBuffer(FrameBuffer *buffer)
 {
-	bufferMap_.emplace(RPi::BufferMask::EXTERNAL_BUFFER | id_.get(), buffer);
+	bufferMap_.emplace(ipa::rpi::MaskExternalBuffer | id_.get(), buffer);
 }
 
 void Stream::removeExternalBuffer(FrameBuffer *buffer)
@@ -78,7 +80,7 @@ void Stream::removeExternalBuffer(FrameBuffer *buffer)
 	int id = getBufferId(buffer);
 
 	/* Ensure we have this buffer in the stream, and it is marked external. */
-	ASSERT(id != -1 && (id & RPi::BufferMask::EXTERNAL_BUFFER));
+	ASSERT(id != -1 && (id & ipa::rpi::MaskExternalBuffer));
 	bufferMap_.erase(id);
 }
 
diff --git a/src/libcamera/pipeline/raspberrypi/rpi_stream.h b/src/libcamera/pipeline/raspberrypi/rpi_stream.h
index 0b502f64..701110d0 100644
--- a/src/libcamera/pipeline/raspberrypi/rpi_stream.h
+++ b/src/libcamera/pipeline/raspberrypi/rpi_stream.h
@@ -13,6 +13,7 @@
 #include <vector>
 
 #include <libcamera/ipa/raspberrypi.h>
+#include <libcamera/ipa/raspberrypi_ipa_interface.h>
 #include <libcamera/stream.h>
 
 #include "libcamera/internal/v4l2_videodevice.h"
@@ -31,13 +32,13 @@ class Stream : public libcamera::Stream
 {
 public:
 	Stream()
-		: id_(RPi::BufferMask::ID)
+		: id_(ipa::rpi::MaskID)
 	{
 	}
 
 	Stream(const char *name, MediaEntity *dev, bool importOnly = false)
 		: external_(false), importOnly_(importOnly), name_(name),
-		  dev_(std::make_unique<V4L2VideoDevice>(dev)), id_(RPi::BufferMask::ID)
+		  dev_(std::make_unique<V4L2VideoDevice>(dev)), id_(ipa::rpi::MaskID)
 	{
 	}